Presentation Title

Stabilization of Tetravalent Oxidation States across the Lanthanide Series

Faculty Mentor

Mikiyas Assefa

Start Date

23-11-2019 11:15 AM

End Date

23-11-2019 11:30 AM

Location

Markstein 102

Session

oral 2

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

The intrinsic chemical properties of the lanthanide elements are still relatively unexplored. This is surprising as the unique electronic, optical, and magnetic properties of these metals render them remarkably energy-efficient alternatives for manufacturing modern technologies. Thus, our goal was to expand the chemically accessible oxidation states available for these elements by stabilizing the much more rare 4+oxidation state. Particularly, we explored the viability of polydentate macrocyclic ligands for the stabilization of tetravalent lanthanide ions in solution. Explored supporting ligands include PPN3P3O9 and Na4P4O12. Solvent combinations were also explored to optimize the isolation of target lanthanide compounds out of their crude mixtures. Analytical techniques such as NMR spectroscopy, X-ray crystallography, and Cyclic Voltammetry were used to evaluate reaction outcomes. 31P NMR spectroscopy was particularly useful in assessing the completion of reactions, since all of our ligands contained metaphosphates, which contain 100% abundant NMR-active 31P nucleus.

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Nov 23rd, 11:15 AM Nov 23rd, 11:30 AM

Stabilization of Tetravalent Oxidation States across the Lanthanide Series

Markstein 102

The intrinsic chemical properties of the lanthanide elements are still relatively unexplored. This is surprising as the unique electronic, optical, and magnetic properties of these metals render them remarkably energy-efficient alternatives for manufacturing modern technologies. Thus, our goal was to expand the chemically accessible oxidation states available for these elements by stabilizing the much more rare 4+oxidation state. Particularly, we explored the viability of polydentate macrocyclic ligands for the stabilization of tetravalent lanthanide ions in solution. Explored supporting ligands include PPN3P3O9 and Na4P4O12. Solvent combinations were also explored to optimize the isolation of target lanthanide compounds out of their crude mixtures. Analytical techniques such as NMR spectroscopy, X-ray crystallography, and Cyclic Voltammetry were used to evaluate reaction outcomes. 31P NMR spectroscopy was particularly useful in assessing the completion of reactions, since all of our ligands contained metaphosphates, which contain 100% abundant NMR-active 31P nucleus.